As a general rule, commercial property owners should begin paying close attention when snow loads approach 20 pounds per square foot or when accumulation reaches around 12 inches, though these are very rough guidelines. The actual weight on your roof depends on the type of snow, how much moisture it contains, and the design of your roofing system. Understanding these variables is essential for protecting your commercial building throughout Idaho’s winter months.
Confirming Your Commercial Roof’s Integrity
Before winter arrives, it’s wise to verify that your roof is prepared for the season ahead. Weathertight Roofing, Inc. has been Idaho’s #1 roofing contractor since 2008 and has completed more than 15,000 commercial roofing projects throughout Boise, Caldwell, Meridian, Eagle, Nampa, Emmett, Treasure Valley, and the surrounding communities.
Our licensed and insured team specializes in commercial roofing systems, including flat and low-slope roofs, and provides honest inspections backed by decades of combined experience. If you have any concerns about your roof’s ability to withstand winter weather, scheduling a professional inspection before heavy snowfall arrives can help identify small issues before they become costly problems.
Snow Type Matters
Not all snow weighs the same. Light, fluffy powder may weigh as little as 5 pounds per cubic foot (PCF), while average packed snow often weighs around 15 to 20 PCF. Wet snow is significantly heavier, frequently reaching 30 PCF. Ice is heavier still, approaching 60 pounds for the same volume.
Rain falling onto the existing snowpack can further increase roof loads, creating conditions that are much more demanding than snowfall alone. Because weather can change rapidly in Idaho, it’s important to consider both the depth and density of accumulated snow.
Are Flat Roofs More Susceptible to Snow Damage?
Many commercial buildings utilize flat or low-slope roofing systems because they provide usable rooftop space for HVAC equipment, solar panels, and other building systems. While these roofs are engineered to support substantial loads, they also retain snow more readily than steep-sloped roofs.
Instead of naturally shedding snow, flat roofs often allow it to accumulate until it melts. If drainage systems become blocked by ice or debris, standing water can develop as temperatures fluctuate. This added weight, combined with ponding water and repeated freeze-thaw cycles, places additional stress on the roofing system.
Routine inspections, proper drainage maintenance, and timely snow removal all help reduce unnecessary stress on commercial flat roofs throughout the winter season.
When to Be Concerned
If snow has already accumulated on your commercial roof, watch for warning signs that may indicate excessive stress, such as:
- Interior ceiling leaks
- Water stains
- Doors or windows that suddenly become difficult to open
- Unusual creaking sounds
- Visible sagging
- Standing water after partial melting
You should also monitor areas around rooftop equipment, drains, and parapet walls where drifting or uneven snow accumulation commonly occurs. These locations can experience significantly greater loads than other portions of the roof.
Schedule an Inspection For Peace of Mind
Don’t wait until heavy snow exacerbates an existing roofing problem. Weathertight Roofing, Inc. provides same-day free estimates and professional commercial roof inspections throughout Idaho.
Whether your building needs a repair, preventative maintenance, or a complete roof replacement, our experienced team can recommend the right solution for your property. Contact us online or call 208-455-7663 (ROOF) today to schedule your inspection and keep your commercial structure prepared for whatever winter brings.